Malt-drying kiln



(No Model.)

0. G. BOSCH.

MALT DRYING KILN.

Patented Aug. 30,: 1892.

I" l W I W I I w W If)! I B r I A) a m 0 l W N m I I m I J a 8 I. H h 6w 1, a h JE 8 I n? 4 8 I u- Y B M\\\\\ FM V UNITED STATES PATENT OFFICE.

CARL G. BOSCH, OF DAVENPORT, IOIVA.

MALT-DRYING KILN.

SPECIFICATION forming part of Letters Patent No. 481,687, dated August30, 1892.

Application filed June 30, 1890. Serial No. 357,244. (No model.)

To all whom it may concern.-

Be it known that I, CARL G. BOSCH, a citizen of the United States,residing at Davenport, n the county of Cook and State of Iowa, haveinvented a new and useful Improvement n Malt-Drying Kilns, of which thefollowing is a specification.

My invention consists in the improved form of malt-drying kilnhereinafter to be more fully described and claimed.

In the drawings, Figure l is a vertical sect on of the malt-drying kiln.Fig. 2 is a plan V ew of the floor located below malt-floor, and Fig. 31s an under view of the ceiling.

In drying malt it is the custom to spread the same on one or moreperforated floors and pass a current of air (frequently artificiallydried and heated) through the same. Said current of air, entering at thebottom of the kiln, is drawn out at the top by suction or by vlrtue ofthe pressure with which it is forced in at the bottom. The difficultyencountered has been that but one outlet being provided for the air thegreater portion thereof passed up through the center of the kiln andlittle or none near the edges, whereby the malt spread on the floor wasunequally dried. To avoid this and to construct a kiln in which thecharge, whether the substance be malt or anything else, spread upon thefloors for drying shall be equally and evenly afiected, I have designedthe construction described and illustrated, in which W represents thewalls of the kiln, in which are one or more perforated floors A A A",the lower floor A having large air-openings, while the perforations in Aand A are very small. The air underneath the first floor A is preferablyintroduced over a heating and drying furnace F and passes up through thefloor A through the special openingsEprovided therefor. These openingsare of varying area, those nearest the walls, and especially thosenearest the corner of the kiln, being the largest, as shown in Fig. 2.These opening are protected by certain overhanging shields e e, whichprevent the material from dropping down through the openings into theair-passage, and also tend somewhat to diffuse the currents of air.

The roof R of the kiln supports a stack S,

in which is preferably placed a suction-apparatus a, although in somecases the natural draft of the heated air up through the kiln will besufficient. The said suction apparatus when used is adapted to draw airby means of a number of branch inlets B B B through various points inthe ceiling C. These openings in the ceiling, to which the branch inletsare connected, may be, of course, of any desired form; but I prefer tomake them in the shape of bells or inverted hoppers H H H, as shown inFigs. 1 and 3. In this way every portion of the ceiling has either anair-opening or is inclined toward one of the air openings and outlets.

Suitable dampers b 5 maybe arranged at any point in the branch pipes B BB.

The branch inlets or pipes may be used without a ceiling or' the ceilingmay be used without the inlet-pipes; but I prefer to use both.

The method of operation of my invention is the following: The air, beingadmitted heneath the lower floor A, will pass up through the specialopenings E provided therefor, and as said openings are largest towardthe edges of the walls the greater quantity of air will be admittedthere. The tendency of the current of air to concentrate at the centralportion of the kiln will therefore be counteracted by this arrangementand by the equal draft extending straight up to the large number ofopenings in the ceiling. Thus the air passing through the said openingsE in the floor A will be compelled to pass directly up near the walls ofthe kiln to the outlets H H H, and the malt distributed on theperforated floors in its path will be evenly dried in the mannerdesired. The function of the lower floor may be accomplished byincreasing the number of openings in the same near the walls and cornersof the same, instead of increasing their sizes, and in this application,wherein the size of the openings near the walls of the kiln is spoken ofas being larger, it includes and means, also, increasing their number.The dampers in the inlet-pipes are also used to regulate the ascent ofair through them, so that the ascending current may be equalized or madegreatest near the walls.

Having therefore described my invention,

what I claim as new, and desire to protect by Letters Patent, is

1. In a malt-drying kiln, the combination, yvith the Walls of thedrying-chamber, of a floor immediately in the line of the air-supplyconnections, said floor being provided with openin gsuniformlyincreasing in size from the central portion of said floor inall directions t0- ward said Walls, a ceiling with openings arrangeduniformly throughout its plane or surface, said openings havingupwardly-extend ingwalls diminishing in crosssection, a draft tower orexit for the air, and perforated floors or trays located intermediate ofthe said floor and ceiling to carry and support the material to bedried, all substantially as described.

2. In a malt-drying kiln, the combination, with the walls of thedrying-chamber, of a floor immediately in the line of the air-supplyconnections, said floor being provided with tubular openings uniformlyincreasing in size from the central portion of said floor in alldirections toward said walls, said tubular openings being provided withoverhanging shields, a ceiling with openings arranged uniformlythroughout its plane or surface, said openings having upwardly-extendingwalls diminishing in cross-section, a draft tower or exit for the air,and perforated floors or trays located intermediate of the said floorand ceiling to carry and support the material to be dried, allsubstantially as described.

CARL G. BOSCH. In presence of FREDERICK SEARLE, Ln KE BROOKS.

